#version 450
layout(local_size_x = 2) in;

struct Data
{
	float a;
	float b;
};

layout(std430, binding = 0) buffer SSBO
{
	Data outdata[];
};

layout(constant_id = 0) const float X = 4.0;

Data data[2] = Data[](Data(1.0, 2.0), Data(3.0, 4.0));
Data data2[2] = Data[](Data(X, 2.0), Data(3.0, 5.0));

Data combine(Data a, Data b)
{
	return Data(a.a + b.a, a.b + b.b);
}

void main()
{
	if (gl_LocalInvocationIndex == 0u)
		outdata[gl_WorkGroupID.x] = combine(data[gl_LocalInvocationID.x], data2[gl_LocalInvocationID.x]);
}